I'm looking for the title and source of a paper by WEERS and
ZARET (sorry, but I don't know the full names...), published in
1975. The papers deals with phytoplankton-zooplankton
relationships in Gatun Lake (Panama). In particular, the Authors
describe the grazing impact of filter-feeders on some colonial
Chroococcales owning gelatinous envelope. These are the only
information I have. Could anybody help me in identifying that paper?

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